<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item to="/home">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <div id="main" style="width: 750px; height: 400px"></div>
    </el-card>
  </div>
</template>

<script>
import * as echarts from 'echarts'
import { getReports } from '@/api'
export default {
  name: 'ReportIndex',
  data() {
    return {
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
    }
  },
  methods: {
    deepMerge(obj1, obj2) {
      for (const key in obj2) {
        // 如果target(也就是obj1[key])存在，且是对象的话再去调用deepMerge，否则就是obj1[key]里面没这个对象，需要与obj2[key]合并
        obj1[key] = obj1[key] && obj1[key] instanceof Object ? this.deepMerge(obj1[key], obj2[key]) : (obj1[key] = obj2[key])
      }
      return obj1
    }
  },
  async mounted() {
    // 基于准备好的dom，初始化echarts实例
    const myChart = echarts.init(document.getElementById('main'))
    const { data: res } = await getReports()
    if (res.meta.status !== 200) return this.$message.error('获取数据失败')
    // console.log(res.data)
    // console.log({ ...res.data, ...this.options })
    // const obj = Object.assgin(res.data, this.options)
    const obj = this.deepMerge(res.data, this.options)
    // 绘制图表
    myChart.setOption(obj)
    // 展示数据
  }
}
</script>

<style></style>
